As OP said, please no external views. Absolutely killing the immersion.
However maybe an option to record and review missions after they are finished. And in review mode maybe you have the option to switch to every camera-perspective including external view and other subs and crew.
Then people can take their precious screenshots and even evaluate their tactics.
That however seems like a lot of work, now that i'm writing it down and may be too much to ask for a two man dev. team.
|